Regeneration method of waste lithium ion battery anode material

Abstract

The invention discloses a regeneration method of a waste lithium ion battery anode material. The method comprises the following steps of mixing a waste anode material, a lithium salt and an additive,and carrying out ball milling to obtain a mixture, wherein the lithium salt is composed of lithium salt LS1, lithium salt LS2 and lithium salt LS3; and the additive is an additive A1 or includes an additive A1 and an additive A2; in an oxidizing atmosphere, taking the mixture as an electrolyte, and using a working electrode and a counter electrode to carry out electrolysis at the temperature of 260-500 DEG C; after electrolysis, removing the working electrode and the counter electrode, continuously heating to 600-680 DEG C at the temperature of 7-12 DEG C.min<-1> in the oxidizing atmosphere, and keeping for 0.3-1 h; then continuously heating to 800-1100 DEG C at 3-6 DEG C. min<-1 > in an oxidizing atmosphere or an inert atmosphere, and keeping for 3-8 h; and cooling, washing, filtering anddrying to obtain the regenerated anode material.

Description

technical field [0001] The invention belongs to the technical field of waste battery recycling, and in particular relates to a method for regenerating a positive electrode material of a waste lithium ion battery. [0002] technical background [0003] Since the commercialization of lithium-ion batteries, they have been widely used in all walks of life due to their many advantages, and the market share is also increasing year by year. Especially in recent years, the rapid development of new energy vehicles has promoted the research and application of ion batteries. It is estimated that the cumulative sales of new energy vehicles will exceed 5 million in 2020, which means that the number of scrapped lithium-ion batteries will increase rapidly in the future. Lithium-ion batteries contain a large amount of valuable metals and organic substances. Direct stacking will bring great harm to the ecological environment and cause waste of resources, so it is of great significance to rati...

AI Technical Summary

Problems solved by technology

[0004] At present, the recovery of waste lithium-ion batteries is mainly to recover the valuable metals in the form of salt through hydrometallurgy or pyrometallurgy and then apply them to other fields. It has the characteristics of various products, but the recovery process is complicated and the loss of metal elements is relatively high. large, low recovery

Considering the sustainable development of the battery industry, recycling waste cathode materials and then synthesizing new cathode materials is a current research hotspot. After recovering various metal elements, new cathode materials are prepared by co-precipitation or hydrothermal methods. The performance is better, but the process is complicated, the conditions are difficult to control, and the economic benefits shown are low

The direct regeneration of positive electrode materials is to restore the composition and structure of the material to the original state through lithium supplementation and heat treatment, and lithium supplementation and heat treatment are usually two intermittent processes, and prior to this, the binder and conductive agent need to be removed in advance, prolonging the The time required for the entire material regeneration process, due to problems such as insufficient lithium supplementation, leads to a certain difference between the electrochemical performance of the regenerated cathode material and the related performance of the commercial cathode material.

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